Rasterization of lines in a polar pixel grid
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United States of America Patent
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Apr 26, 2005
Grant Date -
N/A
app pub date -
Aug 21, 2000
filing date -
Aug 21, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of rasterizing a line on a display having pixels with locations defined by a polar coordinate system uses the sign of a discriminant to choose which of two candidate pixels is to be the next pixel on the rasterized line. The discriminant, which is derived from the desired line, is evaluated at a point in the neighborhood of the candidate pixels. The discriminant value depends on the local slope of the line in polar coordinates. The method divides the line into segments having selected ranges of slope and rasterizes the desired line along each segment.
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